The patch titled
Subject: maple_tree: don't use MAPLE_ARANGE64_META_MAX to indicate no gap
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-dont-use-maple_arange64_meta_max-to-indicate-no-gap.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-dont-use-maple_arange64_meta_max-to-indicate-no-gap.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx>
Subject: maple_tree: don't use MAPLE_ARANGE64_META_MAX to indicate no gap
Date: Tue, 11 Jul 2023 11:54:38 +0800
Patch series "Improve the validation for maple tree and some cleanup", v2.
This patch (of 7):
Do not use a special offset to indicate that there is no gap. When there
is no gap, offset can point to any valid slots because its gap is 0.
Link: https://lkml.kernel.org/r/20230711035444.526-1-zhangpeng.00@xxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20230711035444.526-3-zhangpeng.00@xxxxxxxxxxxxx
Signed-off-by: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/maple_tree.h | 2 --
lib/maple_tree.c | 13 ++-----------
2 files changed, 2 insertions(+), 13 deletions(-)
--- a/include/linux/maple_tree.h~maple_tree-dont-use-maple_arange64_meta_max-to-indicate-no-gap
+++ a/include/linux/maple_tree.h
@@ -29,14 +29,12 @@
#define MAPLE_NODE_SLOTS 31 /* 256 bytes including ->parent */
#define MAPLE_RANGE64_SLOTS 16 /* 256 bytes */
#define MAPLE_ARANGE64_SLOTS 10 /* 240 bytes */
-#define MAPLE_ARANGE64_META_MAX 15 /* Out of range for metadata */
#define MAPLE_ALLOC_SLOTS (MAPLE_NODE_SLOTS - 1)
#else
/* 32bit sizes */
#define MAPLE_NODE_SLOTS 63 /* 256 bytes including ->parent */
#define MAPLE_RANGE64_SLOTS 32 /* 256 bytes */
#define MAPLE_ARANGE64_SLOTS 21 /* 240 bytes */
-#define MAPLE_ARANGE64_META_MAX 31 /* Out of range for metadata */
#define MAPLE_ALLOC_SLOTS (MAPLE_NODE_SLOTS - 2)
#endif /* defined(CONFIG_64BIT) || defined(BUILD_VDSO32_64) */
--- a/lib/maple_tree.c~maple_tree-dont-use-maple_arange64_meta_max-to-indicate-no-gap
+++ a/lib/maple_tree.c
@@ -1610,8 +1610,6 @@ ma_max_gap(struct maple_node *node, unsi
* mas_max_gap() - find the largest gap in a non-leaf node and set the slot.
* @mas: The maple state.
*
- * If the metadata gap is set to MAPLE_ARANGE64_META_MAX, there is no gap.
- *
* Return: The gap value.
*/
static inline unsigned long mas_max_gap(struct ma_state *mas)
@@ -1628,9 +1626,6 @@ static inline unsigned long mas_max_gap(
node = mas_mn(mas);
MAS_BUG_ON(mas, mt != maple_arange_64);
offset = ma_meta_gap(node, mt);
- if (offset == MAPLE_ARANGE64_META_MAX)
- return 0;
-
gaps = ma_gaps(node, mt);
return gaps[offset];
}
@@ -1662,10 +1657,7 @@ static inline void mas_parent_gap(struct
ascend:
MAS_BUG_ON(mas, pmt != maple_arange_64);
meta_offset = ma_meta_gap(pnode, pmt);
- if (meta_offset == MAPLE_ARANGE64_META_MAX)
- meta_gap = 0;
- else
- meta_gap = pgaps[meta_offset];
+ meta_gap = pgaps[meta_offset];
pgaps[offset] = new;
@@ -1678,7 +1670,6 @@ ascend:
ma_set_meta_gap(pnode, pmt, offset);
} else if (new < meta_gap) {
- meta_offset = 15;
new = ma_max_gap(pnode, pgaps, pmt, &meta_offset);
ma_set_meta_gap(pnode, pmt, meta_offset);
}
@@ -2076,7 +2067,7 @@ static inline void mab_mas_cp(struct map
end = j - 1;
if (likely(!ma_is_leaf(mt) && mt_is_alloc(mas->tree))) {
unsigned long max_gap = 0;
- unsigned char offset = 15;
+ unsigned char offset = 0;
gaps = ma_gaps(node, mt);
do {
_
Patches currently in -mm which might be from zhangpeng.00@xxxxxxxxxxxxx are
maple_tree-set-the-node-limit-when-creating-a-new-root-node.patch
maple_tree-add-test-for-mas_wr_modify-fast-path.patch
maple_tree-add-test-for-expanding-range-in-rcu-mode.patch
maple_tree-optimize-mas_wr_append-also-improve-duplicating-vmas.patch
maple_tree-add-a-fast-path-case-in-mas_wr_slot_store.patch
maple_tree-dont-use-maple_arange64_meta_max-to-indicate-no-gap.patch
maple_tree-make-mas_validate_gaps-to-check-metadata.patch
maple_tree-fix-mas_validate_child_slot-to-check-last-missed-slot.patch
maple_tree-make-mas_validate_limits-check-root-node-and-node-limit.patch
maple_tree-update-mt_validate.patch
maple_tree-replace-mas_logical_pivot-with-mas_safe_pivot.patch
maple_tree-drop-mas_first_entry.patch
